Sequential Learning in Unconventional Packaging?

Programmed learning came to the education field in the 1930's through the work of B.F. Skinner and his investigations of operant conditioning--the theory that response from a learner comes after a stimulant is introduced to a given situation, and not before. Cottrell and Butler features the Cenco Programmed Learner which is a cardboard box containing two cardboard paper scrolls with approximately seventy-five feet of paper between the two rolls on opposing ends. They add that the Cenco is a self-paced learning device in the sense that the lesson cannot begin unless users scroll down on the scroll wheels.